Rivet breaker or cutter



Jan. 1, 1 '924 1,479,320

A. G. RlcE- v RIVET- BREAKER OR CUTTER Filed Dec. l0. 1919 they coact; and

Patented `an. l', 1924.

UNITED STATES 'PATEN '1,479,320 T oFFlcE.;

ALBERT e. RICE, CP INDIANAPOLIS, INDIANA, j ssIGNoR vTonton MANUFACTURING i COMPANY, or INDIANAPOLIS, INDIANA.

RIVET BREAKER 0R' CUTTER.

Application filed December 10, 1919. Y Serial No. 343,893.`

To all who/m. t may concern Be it known that I, ALBERT G. RICE, a

citizen of the' United States, residing at Indianapolis, in the countyV of Marion and State of'Indiana, have invented certain new and useful Improvements in Rivet Breakers or Cutters, of which the following is a specication.

rIhe present` invention relates to improvements in that type of apparatus known generally as pneumatic rivet breakers or cut ters, the object inY view being to provide a practical device of this character possessing the strength, power and durability required for the work performed by this class of machines.

The invention, while constructed along generally well-known lines, possesses characteristics which, being lacking in those at present in use, give rise to simplicity, ease in manipulation, and efficiency in results.

To this end the invention consists of a plunger operable by suitable airv pressure to deliver a tremendous blow upon the cutting tool heador a very light blow according to the desire of the operator and by virtue of my particular form of valve which insures the full benefit of the pressure head, the plunger resuming its initial driving position without shock or back kick under the control of a regulatable by-pass.

In carryin out the invention, I also provide shock a sorbingmeans for taking up the impact of the plunger in its movements to and fro.

With these ends in view the invention consists in thel novel combination and arrangement of parts as will be hereinafter fully described and claimed.

For a full understanding of the invention,

showing more clearly the valve passages and the intake and exhaust ports with which Figure 5` is a detail view of the-valve ycated in all the views of the drawingsby nthe same reference characters. Y

`bows 15 and 21 above referred to. portant: feature of'thisinventionresides in; Figure 4 is an enlarged sectional viewA showing more clearly the formation of the intake and exhaust passage.'` y j f Corresponding and like partszare referred to in the following description andindi- Referring tothe drawings and speciically describlng thepreferred embodiment of my lnvention, 1f designates an elongated barrel of suitable VVVdiameter and length uponthe' 4lower end of which is mounted the 'nose piece 2. The end iof the nose lpiecenis. interiorly threaded to receive the bushing 3 which is screwed thereinto and forms ,the

guide holding means for the tool 4 which'is' employed in this device. At the opposite end of the barrel a headpiece 5 is mounted,

mounted thel air controlling valve 8 revolul ving port 14 threaded toreceive ,the street n elbow 15. Directly opposite the inlet-41.()Y the head is also providedgwith a v further port which for the purposes ofdistinction l'I term Athe 'by-pass exhaust port, 1indicatedfat` 16, 'said Port beingthreaded tolreceive the-tubular handle17. y A Y Y l The valve 8 isretained withinthe valve chamber by the cap plate 18 suitably-tothe end of thehead by the fastening means A19. At the lower end 'of the' device I provide a passage through the nose piece 2 and theV side of the barrel, as indicated at-r20to freceive an elbow 2l, a by-pass hose orpipe 2 2 establishing communication between the el- An imafter more specically pointed-out. Within the barrel 1 is` reciprocablyf-mounted the pIungerQ/l which is. adapted ,ftowbet actuated Y to andifroibymeans of Compressed air under the control of the air valvev A8, .this

,plunger titties. sic-.ely ,finto thefbore. f the barrel "and' being 'sus'cepgtible lof' delivering repeated blows upon the head'of'the tool 4. which projects into the harrelasuitable distance. Surrounding the inner end or head of the tool is.a...eoil spring 25. which is secured in any Idesired manner at this n `point .anda-isldesigned. .toireceive'or take vup the impact of ,theplungerwhenA the head lof thev tool iswmateriallyshifted from its normal position. A corresponding spring 26 islmountedat :thehead end of the device so asto absorb the shock of the plunger in ,returning toits initialdriving position un- T dery thecontrol of theby-pass pressure.v

".R'everting. to Ithe construction of# the valve :.-8,' IudesireE tombe understood that one of the maint-efeatures of this Yinvention which makes uit particularlypractical is theA formation of theimain passage 8f: In previous devices of 1 @this character the corresponding passage is usually formed'by making a bore longitudii'iallyof `the. valve, and a corresponding bore transversely through the side of the valve to -intersect the firstfbore,V fThis makes a right angle Npassage Ythrough l which the air under 30'V Apress,uregnust pass before admission into the interior of fthe; barrel. The defect ofV such a-passage lies in the factthat the air is more orless retarded owing to arebound against the-wall of the'longit'udinal bore at the point of intersection ofthe two bores referred to.

1I have foundI by considerable experimentation that th1s':defect orldisadvantage'maybe overcome-withV considerable increase in ef-4 liicie'nzcy of the device by forming l'the main ,passage lin thevalve as shown in Figure 5 more"particularlyof the'drawin'gs. It will :be Yobservedlthat)this passage Sfis formed by` cutting throughV the ,material of the valve from one side land through the bottom, theV j inner wallr/ Vbeingcurved so that the air V'will "passyaroundf theffpassage with substantially no-'t'endency torret'avrdationl into the interior of'4 thebarrel at the head end 'off the same.-'-ThewallA 8 ofthe passage where it meets lthe wall of the port f6 isyflushY with said wall so 'that at :this sidev ofthe passage the least amount of interference is interposed tothe movement ofthe. air-from the valve vinto the. barrel. In addition to thispassage just described. ,the val-vevk is provided with a peripheral passage V8'? formedby routing out a shallow groove extending partiallyfaround thefside 'of-jthevalve `in* such a. Yposition as to establish'communication between two of f the Vports inthe head 5in order to permitof admission `of pressure into/the bypass and the exhausting of the pressure therethrough.

Infthe manufacture of this device, itV may :be addedybothy thenose piece 2 and the head S65;

-piece 5' areflforced upon the ends of the barrel :under the .action of very heavypressure andby a proper-.fusing ofthe material these parts. are so iiXed upon the barrel as to be prevented from Y, becornin'gloosened due. to

the use of .the..jdev ice and vthe' vibrations produced by the reciprocation of the plunger.

men-t, to best carry out the rivet cuttin process the operatorftakes hold of the leftside handle with his left hand and operates the valve handle 9 with-'hisright hand, while a third many supports the tool andholds it on therivet to vbe extracted. lThe cut-out?.

cock ll'is now opened toadmit the air pressure into the head of the cutter device, thus preparing the machine for its operation under the control of the. operator in themanipulation of Athe handle' By raising.this-'v handle tothefdotted line position shownin Figure 3 theV passage Sof the valve establishes communication between -the intake. A10 and the YAport y6entering-the .barrel at the headend.l The full pressure head acts upon:I

the plunger to drive it against the tool head at the.` opposite end,l the handle 9 being .Passing Vnowto the operation of the impley asecornd man, where the appara-tus is of the llarger type, takes hold of Ithe'right-side and quickly .returned-to its initial full.line1po Y sit-ion showny in Figure 3 whereupon tlie'pas- Y sage 8" is connected with the ehaustrlw- Simultaneous with this movement of the handle. lastmentioned the by-*pass passage 8@L is positioned to" admit pressure from the .intake into the by-pass 22,-.which pressure of the plunger Qativvillbe very quick, such returnmay be obtained withoutperceptible shock to the-operators, and. this is a very important feature ofmyinvention. The' great importance of the by-pass regulatingvalve 23 will .beobvious when .it VistakenI yinto account that applicantsI deviceV .will workgefu-ciently on a Vgreat yrange-.,of-.air pressures.

:llO

If, therefore,. the`by-passvalvea23fwere v omitted and the vhylpassQQ provided of'suit- Aable bore 'to' return. `thej 4plunger 24s y.without shock with ,50. pounds'epressurevin theair line, with 90 pounds pressure in the air-line plungeravould Abe returned with considerable vshock or backkicktending: to,V quickly tire the operator and lower theeiiciencyof-both .the device andthe operator. i In.` operating the plunger Qtoag-ain drive lit :againstr the tool thepassagei .just referred .toffwill be so positioned as to open the by-passaport'li' Ato lit'sifeX-haust `portwl,k exhausting the pressure .throughthe handlel 1'7. Y

i It may: bei further.z pointed .outV` that wher ever the contents of the barrel .arefrequired to -be Idisplaced: it only*v vrequires `the 'removalfL of the nose bushing 3 which may readily be screwed in and out of said nose-piece for this purpose, the passage through the nose piece being of a diameter corresponding to the diameter of the bore of the barrel l as will be readily observed by reference to Figure l.

As heretofore premised, it will be obvious from the foregoing that after a little practice, the operator may so control the air pressure that the plunger will deliver a heavy blow upon the tool as when commencing the cutting action, or so actuate said plunger as to deliver a light blow, all of which is obtained by a proper manipulation of the handle 9 of the air control valve. The particular tool may be displaced and another substituted therefore very readily Without the removal of any part for this purpose, and this is a distinct advantage when the tools require sharpening or other treatment.

Having thus described the invention, What I claim as new and desire to secure by Letters Patent, is t 1. A pneumatic implement of the class involving in operation a manually controlled alternating stroke, comprising an elongated barrel having an inlet provided at one side of the head of the barrel to admit a pressure fluid, a plunger reciprocally mounted therein for actuation by said fluid, a rotatable valve mounted in the head of the barrel communicating With saidV inlet and hav- 2. A pneumatic implementy of the class i involving in operation a manually controlled alternating stroke, comprising an elongated barrel having an intake provided at one side of the head of the barrel to admit a pres- Y sure fluid, a plunger reciprocally mounted therein for actuation by said fluid, a rotaseV table valve mounted in the head of the bar- Y rel communicating with said inlet and having an unobstructed passage formed by cutting out the material of the valve through the bottom and one side and mergin the inner Walls of the opening thus forme intov a curved connecting Wall free from shoulders and adapted to direct the full pressure at maximum velocity immediately into the barrel against an end of the plunger, whereby the direction of movement of the uid is changed into line with the movement of the plunger with a minimum loss of effective force, and means for operating said valve.

In testimony whereof I affix my signature.

ALBERT G. RICE. 

